What may have occurred to prevent species that are of the same grade from also belonging to the same clade?

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#Question id: 8911

#Section 2: Evolution

The larvae of some insects are merely small versions of the adult, whereas the larvae of other insects look completely different from adults, eat different foods, and may live in different habitats. Which of the following most directly favors the evolution of the latter, more radical, kind of metamorphosis?

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#Question id: 8931

#Section 2: Evolution

A researcher is trying to construct a molecular-based phylogeny of the entire animal kingdom. Assuming that none of the following genes is absolutely conserved, which of the following would be the best choice on which to base the phylogeny?

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#Question id: 8909

#Section 2: Evolution

Which of the following terms or structures is properly associated only with animals?

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#Question id: 10619

#Section 1: Ecology

Which of the following is incorrect?

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#Question id: 11778

#Section 1: Ecology

Asexually-produced offspring, descended from the same parent and bearing the same genotype, constitute a